1 files changed, 129 insertions, 0 deletions
diff --git a/dom/canvas/WebGLExtensionTextureHalfFloat.cpp b/dom/canvas/WebGLExtensionTextureHalfFloat.cpp
new file mode 100644
index 000000000..e59f9b232
--- /dev/null
+++ b/dom/canvas/WebGLExtensionTextureHalfFloat.cpp
@@ -0,0 +1,129 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WebGLExtensions.h"
+
+#include "GLContext.h"
+#include "mozilla/dom/WebGLRenderingContextBinding.h"
+#include "WebGLContext.h"
+#include "WebGLFormats.h"
+
+namespace mozilla {
+
+WebGLExtensionTextureHalfFloat::WebGLExtensionTextureHalfFloat(WebGLContext* webgl)
+    : WebGLExtensionBase(webgl)
+{
+    auto& fua = webgl->mFormatUsage;
+    gl::GLContext* gl = webgl->GL();
+
+    webgl::PackingInfo pi;
+    webgl::DriverUnpackInfo dui;
+    const GLint* swizzle = nullptr;
+
+    const auto fnAdd = [&fua, &pi, &dui, &swizzle](webgl::EffectiveFormat effFormat)
+    {
+        auto usage = fua->EditUsage(effFormat);
+        usage->textureSwizzleRGBA = swizzle;
+        fua->AddTexUnpack(usage, pi, dui);
+
+        fua->AllowUnsizedTexFormat(pi, usage);
+    };
+
+    const bool needsSwizzle = gl->IsCoreProfile();
+    MOZ_ASSERT_IF(needsSwizzle, gl->IsSupported(gl::GLFeature::texture_swizzle));
+
+    const bool needsSizedFormat = !gl->IsGLES();
+
+    GLenum driverUnpackType = LOCAL_GL_HALF_FLOAT;
+    if (!gl->IsSupported(gl::GLFeature::texture_half_float)) {
+        MOZ_ASSERT(gl->IsExtensionSupported(gl::GLContext::OES_texture_half_float));
+        driverUnpackType = LOCAL_GL_HALF_FLOAT_OES;
+    }
+
+    ////////////////
+
+    pi = {LOCAL_GL_RGBA, LOCAL_GL_HALF_FLOAT_OES};
+    dui = {pi.format, pi.format, driverUnpackType};
+    swizzle = nullptr;
+    if (needsSizedFormat) {
+        dui.internalFormat = LOCAL_GL_RGBA16F;
+    }
+    fnAdd(webgl::EffectiveFormat::RGBA16F);
+
+    //////
+
+    pi = {LOCAL_GL_RGB, LOCAL_GL_HALF_FLOAT_OES};
+    dui = {pi.format, pi.format, driverUnpackType};
+    swizzle = nullptr;
+    if (needsSizedFormat) {
+        dui.internalFormat = LOCAL_GL_RGB16F;
+    }
+    fnAdd(webgl::EffectiveFormat::RGB16F);
+
+    //////
+
+    pi = {LOCAL_GL_LUMINANCE, LOCAL_GL_HALF_FLOAT_OES};
+    dui = {pi.format, pi.format, driverUnpackType};
+    swizzle = nullptr;
+    if (needsSwizzle) {
+        dui = {LOCAL_GL_R16F, LOCAL_GL_RED, driverUnpackType};
+        swizzle = webgl::FormatUsageInfo::kLuminanceSwizzleRGBA;
+    } else if (needsSizedFormat) {
+        dui.internalFormat = LOCAL_GL_LUMINANCE16F_ARB;
+    }
+    fnAdd(webgl::EffectiveFormat::Luminance16F);
+
+    //////
+
+    pi = {LOCAL_GL_ALPHA, LOCAL_GL_HALF_FLOAT_OES};
+    dui = {pi.format, pi.format, driverUnpackType};
+    swizzle = nullptr;
+    if (needsSwizzle) {
+        dui = {LOCAL_GL_R16F, LOCAL_GL_RED, driverUnpackType};
+        swizzle = webgl::FormatUsageInfo::kAlphaSwizzleRGBA;
+    } else if (needsSizedFormat) {
+        dui.internalFormat = LOCAL_GL_ALPHA16F_ARB;
+    }
+    fnAdd(webgl::EffectiveFormat::Alpha16F);
+
+    //////
+
+    pi = {LOCAL_GL_LUMINANCE_ALPHA, LOCAL_GL_HALF_FLOAT_OES};
+    dui = {pi.format, pi.format, driverUnpackType};
+    swizzle = nullptr;
+    if (needsSwizzle) {
+        dui = {LOCAL_GL_RG16F, LOCAL_GL_RG, driverUnpackType};
+        swizzle = webgl::FormatUsageInfo::kLumAlphaSwizzleRGBA;
+    } else if (needsSizedFormat) {
+        dui.internalFormat = LOCAL_GL_LUMINANCE_ALPHA16F_ARB;
+    }
+    fnAdd(webgl::EffectiveFormat::Luminance16FAlpha16F);
+}
+
+WebGLExtensionTextureHalfFloat::~WebGLExtensionTextureHalfFloat()
+{
+}
+
+bool
+WebGLExtensionTextureHalfFloat::IsSupported(const WebGLContext* webgl)
+{
+    gl::GLContext* gl = webgl->GL();
+
+    if (!gl->IsSupported(gl::GLFeature::texture_half_float) &&
+        !gl->IsExtensionSupported(gl::GLContext::OES_texture_half_float))
+    {
+        return false;
+    }
+
+    const bool needsSwizzle = gl->IsCoreProfile();
+    const bool hasSwizzle = gl->IsSupported(gl::GLFeature::texture_swizzle);
+    if (needsSwizzle && !hasSwizzle)
+        return false;
+
+    return true;
+}
+
+IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionTextureHalfFloat, OES_texture_half_float)
+
+} // namespace mozilla